Synthesis of Optically Active Vasicinone Based on Intramolecular Aza-Wittig Reaction and Asymmetric Oxidation<sup>1</sup>
作者:Shoji Eguchi、Toshio Suzuki、Tomohiro Okawa、Yuji Matsushita、Eiji Yashima、Yoshio Okamoto
DOI:10.1021/jo9609283
日期:1996.1.1
deoxyvasicinone was treated with (S)-(+)-reagent to afford (R)-(+)-vasicinone in 71% ee, while the reaction with (R)-(-)-reagent gave (S)-(-)-vasicinone in 62% ee. The optical purity was analyzed by HPLC on specially modified cellulose as a stationary phase. These results provided a facile method to prepare both optical isomers of vasicinone and confirmed the recently reversed stereochemistry of natural (-)-vasicinone
通过两种不同的方法合成了喹唑啉生物碱的两种光学异构体:vasicinone。第一种方法使用(3S)-3-羟基-γ-内酰胺作为手性合成子,在O-TBDMS保护后,将邻叠氮基苯甲酰化,然后用三正丁基膦处理,得到(S)-(-) -vasicinone通过串联的Staudinger /分子内aza-Wittig反应。第二种方法分别用(1S)-(+)-或(1R)-(-)-(10-樟脑磺酰基)恶唑烷(Davis试剂)对脱氧西西酮进行不对称氧化。用(S)-(+)-试剂处理脱氧vasinin的氮杂-烯酸酯阴离子,得到71%ee的(R)-(+)-vasicinone,而与(R)-(-)-试剂的反应得到( S)-(-)-vasininone在62%ee中。通过HPLC在专门改性的纤维素上作为固定相分析光学纯度。